Sharp R-880B Service Manual page 23

LSI(IZA927DR)
The I/O signal of the LSI(IZA927DR) are detailed in the following table.
Pin No. Signal
1 C1
2 VL1
3-5 AN7-AN5
6 AN4
7 AN3
8 AN2
9 AN1
10 AN0
11 P57
12 P56
13 P55
14-18 P54-P50
19 P47
20 P46
21 P45
22 P44
23 INT1
24 INT0
DESCRIPTION OF LSI
I/O
IN Terminal not used.
IN Power source voltage input terminal.
Standard voltage for LCD.
IN Heating constant compensation terminal.
IN Terminal not used.
IN Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the
thermistor, this input is converted into temperature by the A/D converter built into
the LSI.
IN Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opened; "L" level signal.
IN AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected
to the A/D converter built into the LSI.
IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This
input is an analog input terminal from the AH sensor circuit, and connected to
the A/D converter built into LSI.
This input is an analog input terminal from the AH sensor circuit, and connected
to the A/D converter built into the LSI.
OUT Timing signal output terminal for temperature measurement(OVEN
THERMISTOR).
"H" level (GND) : Thermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing. (Convection cooking)
OUT Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
C: When the temperature of the oven
cavity reaches
temperature in the preheating mode,
or when the preheating hold time (30
minutes) is elapsed.
OUT Timing signal output terminal for temperature measurement(OVEN
THERMISTOR).
"H" level (GND) : Thermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing. (Convection cooking)
OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
IN Signal coming from touch key.
When any one of G12 line keys on key matrix is touched, a corresponding signal
from P40, P41, P72, P73, P74, P75, P76 and P77 will be input into P47. When no
key is touched, the signal is held at "L" level.
IN Signal similar to P47.
When any one of G11 line keys on key matrix is touched, a corresponding signal
will be input into P46.
IN Signal similar to P47.
When any one of G10 line keys on key matrix is touched, a corresponding signal
will be input into P45.
IN Signal similar to P47.
When any one of G9 line keys on key matrix is touched, a corresponding signal will
be input into P44.
IN Terminal not used.
IN Signal to synchronized LSI with commercial power source
frequency(50Hz).
This is basic timing for time processing of LSI.
Description
the preset
21
0.12 sec
A
2.4 sec
B
1.2 sec 1.2 sec
H: GND
C
L
20 msec.
R-880B
H : GND
L (-5V)